1 /****************************************************************************** 2 * 3 * Module Name: tbutils - ACPI Table utilities 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2023, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include <contrib/dev/acpica/include/acpi.h> 153 #include <contrib/dev/acpica/include/accommon.h> 154 #include <contrib/dev/acpica/include/actables.h> 155 156 #define _COMPONENT ACPI_TABLES 157 ACPI_MODULE_NAME ("tbutils") 158 159 160 /* Local prototypes */ 161 162 static ACPI_PHYSICAL_ADDRESS 163 AcpiTbGetRootTableEntry ( 164 UINT8 *TableEntry, 165 UINT32 TableEntrySize); 166 167 168 #if (!ACPI_REDUCED_HARDWARE) 169 /******************************************************************************* 170 * 171 * FUNCTION: AcpiTbInitializeFacs 172 * 173 * PARAMETERS: None 174 * 175 * RETURN: Status 176 * 177 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global 178 * for accessing the Global Lock and Firmware Waking Vector 179 * 180 ******************************************************************************/ 181 182 ACPI_STATUS 183 AcpiTbInitializeFacs ( 184 void) 185 { 186 ACPI_TABLE_FACS *Facs; 187 188 189 /* If Hardware Reduced flag is set, there is no FACS */ 190 191 if (AcpiGbl_ReducedHardware) 192 { 193 AcpiGbl_FACS = NULL; 194 return (AE_OK); 195 } 196 else if (AcpiGbl_FADT.XFacs && 197 (!AcpiGbl_FADT.Facs || !AcpiGbl_Use32BitFacsAddresses)) 198 { 199 (void) AcpiGetTableByIndex (AcpiGbl_XFacsIndex, 200 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &Facs)); 201 AcpiGbl_FACS = Facs; 202 } 203 else if (AcpiGbl_FADT.Facs) 204 { 205 (void) AcpiGetTableByIndex (AcpiGbl_FacsIndex, 206 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &Facs)); 207 AcpiGbl_FACS = Facs; 208 } 209 210 /* If there is no FACS, just continue. There was already an error msg */ 211 212 return (AE_OK); 213 } 214 #endif /* !ACPI_REDUCED_HARDWARE */ 215 216 217 /******************************************************************************* 218 * 219 * FUNCTION: AcpiTbCheckDsdtHeader 220 * 221 * PARAMETERS: None 222 * 223 * RETURN: None 224 * 225 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect 226 * if the DSDT has been replaced from outside the OS and/or if 227 * the DSDT header has been corrupted. 228 * 229 ******************************************************************************/ 230 231 void 232 AcpiTbCheckDsdtHeader ( 233 void) 234 { 235 236 /* Compare original length and checksum to current values */ 237 238 if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length || 239 AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum) 240 { 241 ACPI_BIOS_ERROR ((AE_INFO, 242 "The DSDT has been corrupted or replaced - " 243 "old, new headers below")); 244 245 AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader); 246 AcpiTbPrintTableHeader (0, AcpiGbl_DSDT); 247 248 /* Disable further error messages */ 249 250 AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length; 251 AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum; 252 } 253 } 254 255 256 /******************************************************************************* 257 * 258 * FUNCTION: AcpiTbCopyDsdt 259 * 260 * PARAMETERS: TableIndex - Index of installed table to copy 261 * 262 * RETURN: The copied DSDT 263 * 264 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. 265 * Some very bad BIOSs are known to either corrupt the DSDT or 266 * install a new, bad DSDT. This copy works around the problem. 267 * 268 ******************************************************************************/ 269 270 ACPI_TABLE_HEADER * 271 AcpiTbCopyDsdt ( 272 UINT32 TableIndex) 273 { 274 ACPI_TABLE_HEADER *NewTable; 275 ACPI_TABLE_DESC *TableDesc; 276 277 278 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex]; 279 280 NewTable = ACPI_ALLOCATE (TableDesc->Length); 281 if (!NewTable) 282 { 283 ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X", 284 TableDesc->Length)); 285 return (NULL); 286 } 287 288 memcpy (NewTable, TableDesc->Pointer, TableDesc->Length); 289 AcpiTbUninstallTable (TableDesc); 290 291 AcpiTbInitTableDescriptor ( 292 &AcpiGbl_RootTableList.Tables[AcpiGbl_DsdtIndex], 293 ACPI_PTR_TO_PHYSADDR (NewTable), 294 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, NewTable); 295 296 ACPI_INFO (( 297 "Forced DSDT copy: length 0x%05X copied locally, original unmapped", 298 NewTable->Length)); 299 300 return (NewTable); 301 } 302 303 304 /******************************************************************************* 305 * 306 * FUNCTION: AcpiTbGetRootTableEntry 307 * 308 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry 309 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT) 310 * 311 * RETURN: Physical address extracted from the root table 312 * 313 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on 314 * both 32-bit and 64-bit platforms 315 * 316 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on 317 * 64-bit platforms. 318 * 319 ******************************************************************************/ 320 321 static ACPI_PHYSICAL_ADDRESS 322 AcpiTbGetRootTableEntry ( 323 UINT8 *TableEntry, 324 UINT32 TableEntrySize) 325 { 326 UINT32 Address32; 327 UINT64 Address64; 328 329 330 /* 331 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): 332 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT 333 */ 334 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE) 335 { 336 /* 337 * 32-bit platform, RSDT: Return 32-bit table entry 338 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return 339 */ 340 ACPI_MOVE_32_TO_32(&Address32, TableEntry); 341 return Address32; 342 } 343 else 344 { 345 /* 346 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return 347 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, 348 * return 64-bit 349 */ 350 ACPI_MOVE_64_TO_64 (&Address64, TableEntry); 351 352 #if ACPI_MACHINE_WIDTH == 32 353 if (Address64 > ACPI_UINT32_MAX) 354 { 355 /* Will truncate 64-bit address to 32 bits, issue warning */ 356 357 ACPI_BIOS_WARNING ((AE_INFO, 358 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," 359 " truncating", 360 ACPI_FORMAT_UINT64 (Address64))); 361 } 362 #endif 363 return ((ACPI_PHYSICAL_ADDRESS) (Address64)); 364 } 365 } 366 367 368 /******************************************************************************* 369 * 370 * FUNCTION: AcpiTbParseRootTable 371 * 372 * PARAMETERS: RsdpAddress - Pointer to the RSDP 373 * 374 * RETURN: Status 375 * 376 * DESCRIPTION: This function is called to parse the Root System Description 377 * Table (RSDT or XSDT) 378 * 379 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must 380 * be mapped and cannot be copied because it contains the actual 381 * memory location of the ACPI Global Lock. 382 * 383 ******************************************************************************/ 384 385 ACPI_STATUS ACPI_INIT_FUNCTION 386 AcpiTbParseRootTable ( 387 ACPI_PHYSICAL_ADDRESS RsdpAddress) 388 { 389 ACPI_TABLE_RSDP *Rsdp; 390 UINT32 TableEntrySize; 391 UINT32 i; 392 UINT32 TableCount; 393 ACPI_TABLE_HEADER *Table; 394 ACPI_PHYSICAL_ADDRESS Address; 395 UINT32 Length; 396 UINT8 *TableEntry; 397 ACPI_STATUS Status; 398 UINT32 TableIndex; 399 400 401 ACPI_FUNCTION_TRACE (TbParseRootTable); 402 403 404 /* Map the entire RSDP and extract the address of the RSDT or XSDT */ 405 406 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP)); 407 if (!Rsdp) 408 { 409 return_ACPI_STATUS (AE_NO_MEMORY); 410 } 411 412 AcpiTbPrintTableHeader (RsdpAddress, 413 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp)); 414 415 /* Use XSDT if present and not overridden. Otherwise, use RSDT */ 416 417 if ((Rsdp->Revision > 1) && 418 Rsdp->XsdtPhysicalAddress && 419 !AcpiGbl_DoNotUseXsdt) 420 { 421 /* 422 * RSDP contains an XSDT (64-bit physical addresses). We must use 423 * the XSDT if the revision is > 1 and the XSDT pointer is present, 424 * as per the ACPI specification. 425 */ 426 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress; 427 TableEntrySize = ACPI_XSDT_ENTRY_SIZE; 428 } 429 else 430 { 431 /* Root table is an RSDT (32-bit physical addresses) */ 432 433 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress; 434 TableEntrySize = ACPI_RSDT_ENTRY_SIZE; 435 } 436 437 /* 438 * It is not possible to map more than one entry in some environments, 439 * so unmap the RSDP here before mapping other tables 440 */ 441 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP)); 442 443 /* Map the RSDT/XSDT table header to get the full table length */ 444 445 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER)); 446 if (!Table) 447 { 448 return_ACPI_STATUS (AE_NO_MEMORY); 449 } 450 451 AcpiTbPrintTableHeader (Address, Table); 452 453 /* 454 * Validate length of the table, and map entire table. 455 * Minimum length table must contain at least one entry. 456 */ 457 Length = Table->Length; 458 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER)); 459 460 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize)) 461 { 462 ACPI_BIOS_ERROR ((AE_INFO, 463 "Invalid table length 0x%X in RSDT/XSDT", Length)); 464 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 465 } 466 467 Table = AcpiOsMapMemory (Address, Length); 468 if (!Table) 469 { 470 return_ACPI_STATUS (AE_NO_MEMORY); 471 } 472 473 /* Validate the root table checksum */ 474 475 Status = AcpiUtVerifyChecksum (Table, Length); 476 if (ACPI_FAILURE (Status)) 477 { 478 AcpiOsUnmapMemory (Table, Length); 479 return_ACPI_STATUS (Status); 480 } 481 482 /* Get the number of entries and pointer to first entry */ 483 484 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) / 485 TableEntrySize); 486 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER)); 487 488 /* Initialize the root table array from the RSDT/XSDT */ 489 490 for (i = 0; i < TableCount; i++) 491 { 492 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ 493 494 Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize); 495 496 /* Skip NULL entries in RSDT/XSDT */ 497 498 if (!Address) 499 { 500 goto NextTable; 501 } 502 503 Status = AcpiTbInstallStandardTable (Address, 504 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, NULL, FALSE, TRUE, 505 &TableIndex); 506 507 if (ACPI_SUCCESS (Status) && 508 ACPI_COMPARE_NAMESEG ( 509 &AcpiGbl_RootTableList.Tables[TableIndex].Signature, 510 ACPI_SIG_FADT)) 511 { 512 AcpiGbl_FadtIndex = TableIndex; 513 AcpiTbParseFadt (); 514 } 515 516 NextTable: 517 518 TableEntry += TableEntrySize; 519 } 520 521 AcpiOsUnmapMemory (Table, Length); 522 return_ACPI_STATUS (AE_OK); 523 } 524 525 526 /******************************************************************************* 527 * 528 * FUNCTION: AcpiTbGetTable 529 * 530 * PARAMETERS: TableDesc - Table descriptor 531 * OutTable - Where the pointer to the table is returned 532 * 533 * RETURN: Status and pointer to the requested table 534 * 535 * DESCRIPTION: Increase a reference to a table descriptor and return the 536 * validated table pointer. 537 * If the table descriptor is an entry of the root table list, 538 * this API must be invoked with ACPI_MTX_TABLES acquired. 539 * 540 ******************************************************************************/ 541 542 ACPI_STATUS 543 AcpiTbGetTable ( 544 ACPI_TABLE_DESC *TableDesc, 545 ACPI_TABLE_HEADER **OutTable) 546 { 547 ACPI_STATUS Status; 548 549 550 ACPI_FUNCTION_TRACE (AcpiTbGetTable); 551 552 553 if (TableDesc->ValidationCount == 0) 554 { 555 /* Table need to be "VALIDATED" */ 556 557 Status = AcpiTbValidateTable (TableDesc); 558 if (ACPI_FAILURE (Status)) 559 { 560 return_ACPI_STATUS (Status); 561 } 562 } 563 564 if (TableDesc->ValidationCount < ACPI_MAX_TABLE_VALIDATIONS) 565 { 566 TableDesc->ValidationCount++; 567 568 /* 569 * Detect ValidationCount overflows to ensure that the warning 570 * message will only be printed once. 571 */ 572 if (TableDesc->ValidationCount >= ACPI_MAX_TABLE_VALIDATIONS) 573 { 574 ACPI_WARNING((AE_INFO, 575 "Table %p, Validation count overflows\n", TableDesc)); 576 } 577 } 578 579 *OutTable = TableDesc->Pointer; 580 return_ACPI_STATUS (AE_OK); 581 } 582 583 584 /******************************************************************************* 585 * 586 * FUNCTION: AcpiTbPutTable 587 * 588 * PARAMETERS: TableDesc - Table descriptor 589 * 590 * RETURN: None 591 * 592 * DESCRIPTION: Decrease a reference to a table descriptor and release the 593 * validated table pointer if no references. 594 * If the table descriptor is an entry of the root table list, 595 * this API must be invoked with ACPI_MTX_TABLES acquired. 596 * 597 ******************************************************************************/ 598 599 void 600 AcpiTbPutTable ( 601 ACPI_TABLE_DESC *TableDesc) 602 { 603 604 ACPI_FUNCTION_TRACE (AcpiTbPutTable); 605 606 607 if (TableDesc->ValidationCount < ACPI_MAX_TABLE_VALIDATIONS) 608 { 609 TableDesc->ValidationCount--; 610 611 /* 612 * Detect ValidationCount underflows to ensure that the warning 613 * message will only be printed once. 614 */ 615 if (TableDesc->ValidationCount >= ACPI_MAX_TABLE_VALIDATIONS) 616 { 617 ACPI_WARNING ((AE_INFO, 618 "Table %p, Validation count underflows\n", TableDesc)); 619 return_VOID; 620 } 621 } 622 623 if (TableDesc->ValidationCount == 0) 624 { 625 /* Table need to be "INVALIDATED" */ 626 627 AcpiTbInvalidateTable (TableDesc); 628 } 629 630 return_VOID; 631 } 632